WO2016142502A1 - Bone plate with a bone screw - Google Patents

Bone plate with a bone screw Download PDF

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Publication number
WO2016142502A1
WO2016142502A1 PCT/EP2016/055237 EP2016055237W WO2016142502A1 WO 2016142502 A1 WO2016142502 A1 WO 2016142502A1 EP 2016055237 W EP2016055237 W EP 2016055237W WO 2016142502 A1 WO2016142502 A1 WO 2016142502A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
thread
bone
bone plate
characterized
Prior art date
Application number
PCT/EP2016/055237
Other languages
German (de)
French (fr)
Inventor
Urs Hulliger
Michael RIESE
Tino HARZ
Frank Orschler
Original Assignee
Königsee Implantate GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE102015003087.6 priority Critical
Priority to DE102015003087 priority
Priority to DE102016002444.5A priority patent/DE102016002444A1/en
Priority to DE102016002444.5 priority
Application filed by Königsee Implantate GmbH filed Critical Königsee Implantate GmbH
Publication of WO2016142502A1 publication Critical patent/WO2016142502A1/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8052Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
    • A61B17/8057Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Threaded wires, pins or screws; Nuts therefor
    • A61B17/8605Heads, i.e. proximal ends projecting from bone

Abstract

The invention relates to an osteosynthesis device with a bone plate and with at least one bone screw, wherein the bone plate has at least one through-hole with a conical inner thread formed at least in part in the through-hole. Moreover, the bone screw has a screw shank and also a screw head with a conical thread, with the possibility of forming a connection at a variable and stable angle between bone screw and bone plate by receiving the screw head with conical outer thread in the respective through-hole of the bone plate. According to the invention, the thread in the screw head has a first portion A with a first conicity and a second portion B with a second conicity, wherein a zone of discontinuity with respect to the conicity is present between the first portion A and the second portion B.

Description

BONE PLATE WITH A BONE SCREW

description

The invention relates to an osteosynthesis device having a bone plate as well as with at least one bone screw, wherein the bone plate has at least one through hole with an at least partially formed in the through hole conical inner thread, further, the bone screw having a screw shank and a screw head with a conical thread with the possibility of formation a variably angularly stable connection between the bone screw and bone plate by receiving the screw head with a conical external thread in the respective through-hole of the bone plate according to the preamble of claim 1 and a bone screw with a screw head and a screw shank, wherein the screw head has a conical external thread, according to the preamble of claim 9.

DE 102005 042766 B4 Piattenloch a bone plate for osteosynthesis is already known. The plate hole has a distributed around its circumference thread star of radially pointing to the hole axis threaded portions threaded teeth and a Lochausbuchtung located between each two adjacent thread teeth and a tapered in the screwing-up, conical thread core diameter. The plate hole has a lying in the screwing-up dome-shaped screw head socket to obtain a full-surface contact between a screw head of a round head screw and a screw head socket such that said plate hole is suitable for selectively receiving the round head screw or a threaded-head screw, thereby in the screwed state a variable with respect to the hole axis designed to ensure angle or an angularly stable screws. From WO 2008/115318 a system for winkelva ables connection between a bone plate and one or more bone screws is previously known, and the respective screw heads of the bone screws have an external thread, the course of which corresponds to a predetermined radius around an imaginary center point of the screw head.

In a similar Läsungsrichtung the bone plate system proceeds with variable angle stable compound according to EP 2559392 Bl, the hold through holes therein for use coming bone plates which have thread-free sections, and wherein the thread-free

Sections of the bone plate to the bone plate top to bottom extend continuously.

In the Krtochenschraube to DE 10 2006 060 933 Al the latter has a defining a longitudinal axis on shank and a head designed as a thickener, wherein the shaft and head bear a thread.

The thread of the shaft, the so-called bone thread, is in this solution in the prior art without interruption into the threads on the shaft and which adjoins the expanding region of the head. As a result, there is a part of the thread-carrying head in the bone tissue, whereby a larger bone screw-bone contact surface is to be provided and there is a better distribution and transfer of loads and forces.

The fixation system for bones according to DE 198 58 889 B4 a connector carrier in the form of a bone plate is provided with at least one through hole. In addition, a bone screw inserted into a through-hole is at least provided, wherein a mutual alignment at different angles is given. The means for fixing comprise a threaded connection formed by screwing in the bone screw at a certain angle by a preformed thread below at least one of the seating surfaces by forming at below the seating surfaces of the bone screw and connecting beams. From the generic DE 10 2010038 949 AI an osteosynthesis is device with a bone plate and at least one bone screw is known, wherein the bone plate comprises at least one threaded bore and the bone screw is provided with a screw head having an external thread, further wherein the threaded bore is a multi-start internal thread and the bone screw has a single start external thread.

According to that task, the bone screw is to be screwed at different angles into the threaded hole of the bone plate and it should be possible to transmit high forces to the bone plate. According to the teaching there is provided that the pitches of the external thread of the bone screw and the internal thread of the threaded hole are equal, whereby a clamping will be achieved after gripping the thread that initiates the angular stability of the compound.

In order to facilitate the screwing of the bone screw prior to the bone plate at different angles, it is provided that the bone screw has a conical external thread.

To achieve the object according to DE 10 2010038 949 AI is provided in particular that the external thread of the bone screw has an incision at least that is tapered to the longitudinal axis of the bone screw. In a preferred embodiment a plurality of incisions, preferably four cuts are provided which are evenly distributed over the circumference of the external thread of the bone screw shown. The incisions are kreisseg- ment-shaped configuration, wherein the axis of the incision is preferably parallel to the generatrix of the external thread. The aforementioned cuts

have the task that the thread access soon as possible after placing of the external thread to the internal thread, without the bone screw needs to be rotated unnecessarily.

From the foregoing, it is an object of the invention to provide a further developed osteosynthesis device having a bone plate as well as with at least one bone screw, wherein the bone plate has at least one through hole with an at least partially formed in the through hole conical internal thread. The advanced processing Osteosynthesevorrich- should have a favorable insertion torque and high locking stability. In particular, it must be ensured that then, when the

Bone screw is introduced perpendicular to the longitudinal axis of the bone plate in the through hole, a very stable locking is added which is at least that which is present in osteosynthesis devices with non-angle-variable configuration of the respective screw connections.

The object of the invention is carried out by the combination of features according to the teaching of claim 1 and the osteo described therein synthesis apparatus consisting of bone plate and at least one bone screw, as well as with a bone screw with a screw head and a screw shank, wherein the screw head has a conical external thread , according to the feature combination of claim 9, wherein the sub-claims represent at least expedient embodiments and developments.

It is therefore assumed that an osteosynthesis with a bone plate as well as with at least one bone screw, wherein the bone plate has at least one through hole with an at least partially formed in the through hole conical external thread. The definition of bone plate and Durchgartgsloch with at least partially trained conical thread is not intended to be limiting, but it may be, of course, completely different, anatomical bone plates having a plurality of through holes, wherein at least one of the through holes having the above-mentioned conical internal thread.

What is relevant is that the bone screw has a screw shank and a screw head with a conical external thread with the possibility of forming a stable connection between the variable angle

Bone screw and bone plate by receiving the screw head with a conical external thread into the respective through-hole of the bone plate. According to the invention, the external thread in the screw head is especially designed to the effect that a first section B is provided with a second taper A with a first taper and a second portion, wherein between the first section A and the second section B to a

Conicity related Unstetigkeitssteiie present.

Under Unstetigkeitssteiie a transition from the first to the second taper conicity is understood here that extends abruptly. The Unstetigkeitssteiie may in this case have a first discontinuity point with a following continuous profile and an adjoining second discontinuity, said discontinuity point between first and second there is no taper of the thread,

It is also within the meaning of the invention that the first and second

Section a third section with turn modified taper continues without departing from the spirit of the invention,

According to the invention, the first portion A is directed to the end of the screw head and the second section B to the screw shaft. Lower end of the screw head, the screw head side is understood to be used for receiving or the presence or insertion of a tool for operating the screw.

In particular according to the invention, the threads in the screw head is designed as biconical or conical multiple threads, with the taper in the first section A B is less than the cone in the second section realized.

The smaller cone or cone angle corresponding substantially to the conicity of the thread in the through hole.

In a preferred development of the invention the cone angle of the first taper is substantially 10 ° to 20 °, preferably 14 ° to 16 °, and the cone angle of the second taper at substantially 23 ° to 30 °, preferably 24 ° to 26 °. Due to the larger cone angle and therefore steeper Kon us carried out at ei nem, preferably deviating from the perpendicular to the bone plate angle of inclination of up to 15 °, a sel bständiges egg .Knochenschraube nziehen in the through-hole thread.

The osteosynthesis device comprises weiterhi n specially configured internal thread in the. or the through holes of the bone plate so that a plurality are formed nsch consuming site-directed to the bone plate top or to the egg, circumferentially arranged distributed Preistellungen in the form of thread-free recesses, which may also extend over only a part of the depth of the respective through hole. Basically, however, is to be maintained, the tendency for the thread interruption bottom plates for abnim mt.

This means that the inner threaded walls in the respective Durchgangstoch of the bone plate in the region to the bone plate bottom side is substantially u nterbrech formed ungsfrei.

According to the invention moreover ei ne Knochensch rob w ith a screw head and a screw shank, the screw head ufweist a conical AuSengewinde a and the thread in the Sch-consuming head has a first section A with a first taper and a second section B has a second taper, wherein B there is a related to the conicity Unstetigkeitsstel le between the first section a and the second portion. The erfi ndungsgemäße Knochensch screw has the by a first portion A, the head end of the screw, and a second Absch Nitt B, the shaft for consuming Sch is directed towards. The threaded walls in the screw head is a ls formed doppelkon Steam threaded walls, said con us in the first section A is smaller than the cone in the second Absch Nitt B.

In particular, the cone angle of the first taper is in Wesentl cozy 10 ° to 20 °, preferably 14 ° to 16 °, and the Konuswin kel d he second Kon izität at the Wesentl cozy 23 ° to 30 °, preferably 24 ° to 26 °. The invention will be further explained with reference to an embodiment and with the aid of figures.

Shown are; a sectional view of the osteosynthesis device according to the invention with synthesis bone plate and a bone screw, wherein the bone plate has a through hole with a conical inner thread; a detailed illustration on the basis of Figure I with the portions A and B, wherein the portion is A as a holding area and the portion B is defined as a recess portion, in the sense of an independent retraction of the respective bone screw in the thread in the respective through-hole. a sectional view with recognizable blocking of the screw thread in the slant plane on sharp corners in the regions X and Y; a sectional view taken along lines AA of Figure 3 is chosen with a recognizable there Verbiockung over the entire cone region in the regions Z, the sectional view of Figure 4 at an angle of 90 ° to the view according to FIG 3...; a sectional view of Verbiockung with improved

Holding torque;

Figure 6 is an explanatory diagram regarding the displacement cross-sections in forming a solid connection between the bone screw and bone plate.

Fig. 7 is a sectional view through a bone plate according to the invention with through-hole having a conical internal thread and wherein an exemption in the form of a thread-free recess is provided,

Fig. 8 is a view similar to that of Fig. 7, but

teilweggebrochen and partly in perspective, and

FIG. 9a-f different ways of development of the exemptions in the form of non-threaded recesses.

The osteosynthesis device described in the figures assumes a bone plate 1 and at least one bone screw 2 from, the bone plate 1 has at least one through-hole 3 with an at least partially formed in the through hole conical internal thread. 4

The bone screw 2 has a screw shaft 5, and a screw head. 6

The screw head 6 has a special conical thread with the possibility of forming a variably angularly stable connection between the bone screw 2 and Knochenpiatte 1 by receiving the screw head 6 with the special conical outer thread in the respective through-hole 3 of the bone plate. 1

The thread in the screw head 5 has a first portion A (see Fig. 2), referred to therein as retaining region, denoted by a first taper and a second section B there as a recess portion with a second taper, wherein between the first section A and the second section B there is a related to the conicity of discontinuity US.

The first section A is directed to the end of the screw head and the second section B to the screw shaft. 5

In a preferred embodiment the cone angle, as shown in FIG. 1, the conical thread has a conicity of 16 °, the thread being realized double thread in the bone plate 1 in the bone plate 1. In a corresponding embodiment, moreover, the conical threads in the bone plate or i in the through hole 3 of the bone plate 1. five circumferentially distributed exemptions z. As in V-shape at the thread circumference, as is illustrated also with reference to FIGS. 7 and 8.

The screw head 6 has, as shown by the figures, particularly to Figure 1, a biconical head thread, from 16 ° on the one hand as well as 22 ° to 26 ° on the other.

The smaller the cone of 16 ° at the head thread corresponds to the cone angle of 18 ° in the through hole 3 of the bone plate. 1

The screw thread profile corresponds to the profile of the thread in the bone plate 1. The angle of inclination illustrated in Fig. 1 can be selected in the range of 0 ° to 15 °. In the case of an inclination angle of 0 °, the bone screw is introduced perpendicular to the longitudinal axis of the bone plate 1 in the thread-prone through hole. 3

Through the second, steeper cone of 22 ° to 26 ° on the screw head 6, in FIG. 2 are denoted by B, is at a large inclination angle of the bone screw 2 to the bone plate 1, an independent feeding of the bone screw 2 in the thread in the respective through-hole 3 of the bone plate 1 secured.

By the independent retraction of the bone screw into the thread in the through hole 3 of the bone plate 1 is on the one hand a positive locking of the screw thread with the Platt thread in the inclination plane of the

Screw according to the illustration of FIG. 3 and on the other hand a positive locking of the screw thread with the thread according to Platt 'section AA according to FIG. 4 (90 °) is reached.

In the areas in between both threads are connected by a partial deformation / reshaping of the thread crests.

When using a hardened bone screw and a bone plate in this regard uncured only thread in the through hole of the bone plate is deformed, wherein the bone screw remains undamaged on the other hand. However, a stable locking is possible bone plate and bone screw with respect and with materials of the same hardness.

The Verbiocken of the screw thread takes place in the plane of inclination on the marked corners according to Fig. 3, regions X and Y, and 90 ° thereto over the entire cone region, see FIG. 4, regions 2. By an optimized configuration of the conical areas of discontinuity a optimum holding force achieved with minimum insertion torque of the threaded connection.

In contrast to a configuration with a radius of the screw head thread an improved holding torque is achieved by the discontinuity in the sense of a "square" design. The conical portion which comes in completely screwed screw to bear, is significantly compared to a variant, with radius according to the prior art improved as symbolizes the Fig. 5, together with local brief explanations, it is therefore the area A substantially greater than the area A ".

In relation to Figures 5 and 6, reference numeral 12A designates the envelope of the crests of the biconical screw in the threaded area A, that is, the Haitebereich, the reference numeral 12B, the envelope of the crests of the biconical screw in the threaded portion B, ie in the recess portion, and the reference numeral 13, the envelope the thread crests of the screw with the radius of the screw head thread.

Another advantage of the embodiment according to the invention is that the screw-in of the bone screw is reduced in the .Knochenplatte by a displacement smaller cross section, which is evident from the illustrations according to Fig. 6. The area of ​​the triangle Fl in FIG 6 that the displacement cross-section of the biconical screw

represents is to obtain the area F is smaller than the area of ​​triangle equivalent F2, which represents the displacement cross-section of the screw with the radius of the screw head thread. The above leads to a lower displacement work with the consequence of a lower Einschraubwiderstandes in Erzeugng a stable lock according to the inventive solution,

With the help of Figs. 7 and 8 the structure of the free positions in the form of non-threaded recesses in the respective through-hole to the

Bone plate will be explained.

The free positions 10, which are arranged circumferentially distributed in the corresponding through hole, ensure that the thread of the bone screw in an inclined position can be set on the flat thread and the bone screw is drawn into the flat thread upon tightening.

By based on the depth of the through hole or the plate thickness is not continuous formation of the free positions 10 or the decreasing extent of the free positions in the direction of base plate results in two areas of the flat thread. The area BP allows the retraction of the bone screw into the flat thread. In the area AP improved blocking of the bone screw is achieved in Platt thread.

By the non-continuous design or zunehmendev reduction of the free positions also by the maximum torque of the screw is increased by the plate, since the area AP having an increasingly intact, full Platt thread. In contrast to free positions of the prior art with transition angles of cutting the thread of the shallower wedge of the inventive solution allows for easier penetration of the screw thread in the Platt thread. This results in an improved workability of the threads and preventing otherwise interfering chip formation. Furthermore, the above-described configuration leads to a reduction of the insertion torque of the screw.

The Fig. 9 shows the basis of FIGS. 7 and 8, other possible embodiments and configurations of the geometric free positions 10. The positions 10 are free to be so designed that the transitional angle α shown in Fig. 9 is <40 °. The flank angle of the threads in the plate and the respective screw is usually 60 °. From this standard configuration drift can be carried out according to the invention, for example in the range of 50 ° to 70 °, the thread flanks may furthermore have a different flank angle at Platt thread, as it is the screw threads of the case. For example, in a screw coarser hardness, a smaller angle compared with the flank angle of the plate can be chosen to ensure a better lure. For example, 55 ° can be at a relatively soft bone plate and a screw hardness greater adaptation of the edge angle of the plate of substantially 65 ° and the screw of substantially be made to optimize the Eindrehverhalten and the lure.

Claims

claims
1. An osteosynthesis device having a bone plate (1) and with
at least one bone screw (2), wherein the bone plate (1)
at least one through hole (3) having a, in the through hole (3) at least partially formed conical internal thread (4), further the bone screw (2) a screw shaft (5) and a screw head (6) with a conical thread having the possibility of forming a variably angularly stable connection between
Bone screw (2) and bone plate (1) by taking up the
The screw head (6) with a conical external thread in the respective
Through hole (3) of the bone plate (1),
characterized, in that
the thread in the screw head (6) a first portion (A) with a first taper and a second portion (B) has a second taper, wherein between the first portion (A) and the second portion (B) related to the conicity discontinuity point (US) is present.
2. The osteosynthesis device of claim 1,
characterized, in that
the first section (A) to the end of the screw head (6) and the second
is directed portion (B) to the screw shaft (5).
3. The osteosynthesis device according to claim 1 or 2,
characterized, in that
the thread in the screw head (6) is designed as biconical thread, wherein the cone is realized in the first section (A) is smaller than the cone in the second section (B).
4. The osteosynthesis device according to claim 3,
characterized, in that
corresponds to the smaller cone or taper angle substantially equal to the conicity of the thread in the through hole (3).
5, osteosynthesis device of one of the preceding claims, characterized, in that
the cone angle of the first taper at substantially 10 ° to 20 °, preferably 14 ° to 16 ° and the cone angle of the second taper at substantially 23 ° to 30 °, preferably is 24 ° to 26 °.
6. The osteosynthesis device of claim 5,
characterized, in that
is done by the larger cone angle and therefore steeper cone at a, relative to that of the normal of the bone plate (1) deviating angle of inclination of up to 15 ° an independent feeding of the bone screw (2) in the conical thread in the through hole (3),
7, osteosynthesis device of one of the preceding claims, characterized, in that
the internal thread in the respective through hole (3) of the bone plate (1) has a plurality directed to the bone plate or to the top Einschraubseite, distributed peripherally arranged free positions (1.0) in the form of
having unthreaded recesses,
8, osteosynthesis device according to claim 7,
characterized, in that
the internal thread in the respective through hole (3) of the bone plate (1) in the region of the bone plate base is formed without interruption.
9. A bone screw, characterized characterized with a screw head (6) and a screw shaft (5), wherein the screw head (6) has a conical external thread that
the thread in the screw head (6) a first portion (A) with a first taper and a second portion (B) has a second taper, wherein between the first portion (A) and the second portion (B) related to the conicity of discontinuity (US) is present.
10. A bone screw according to claim 9,
characterized, in that
the first section (A) to the end of the screw head (6) and the second portion (B) to the screw shaft (5) is directed.
11. A bone screw according to claim 9 or 10,
characterized, in that
the thread in the screw head (6) is designed as biconical thread, wherein the cone is realized in the first section (A) is smaller than the cone in the second section (B).
12. A bone screw according to claim 9, 10 or 11,
characterized, in that
the cone angle of the first taper is substantially 10 ° to 20 °, preferably 14 ° to 16 °, and the cone angle of the second taper at substantially 23 ° to 30 °, preferably is 24 ° to 26 ° at.
PCT/EP2016/055237 2015-03-11 2016-03-11 Bone plate with a bone screw WO2016142502A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE102015003087.6 2015-03-11
DE102015003087 2015-03-11
DE102016002444.5A DE102016002444A1 (en) 2015-03-11 2016-02-29 Osteosynthesis device with a bone plate as well as with at least one bone screw
DE102016002444.5 2016-02-29

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16709440.8A EP3267913A1 (en) 2015-03-11 2016-03-11 Bone plate with a bone screw
US15/546,594 US10335213B2 (en) 2015-03-11 2016-03-11 Bone plate with a bone screw

Publications (1)

Publication Number Publication Date
WO2016142502A1 true WO2016142502A1 (en) 2016-09-15

Family

ID=56801090

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/055237 WO2016142502A1 (en) 2015-03-11 2016-03-11 Bone plate with a bone screw

Country Status (4)

Country Link
US (1) US10335213B2 (en)
EP (1) EP3267913A1 (en)
DE (1) DE102016002444A1 (en)
WO (1) WO2016142502A1 (en)

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US7951176B2 (en) 2003-05-30 2011-05-31 Synthes Usa, Llc Bone plate
AU2003254686B2 (en) 2003-08-26 2008-04-24 Synthes Gmbh Bone plate
US8574268B2 (en) 2004-01-26 2013-11-05 DePuy Synthes Product, LLC Highly-versatile variable-angle bone plate system

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WO2008115318A1 (en) 2007-03-21 2008-09-25 The University Of North Carolina At Chapel Hill Anti-unscrewing and multi-angular fastening apparatuses and methods for surgical bone screw/plate systems
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Publication number Priority date Publication date Assignee Title
DE19858889B4 (en) 1998-12-19 2008-08-07 Wolter, Dietmar, Prof. Dr.Med. Fixation system for bones
DE102005042766B4 (en) 2005-07-13 2009-08-20 Königsee Implantate und Instrumente zur Osteosynthese GmbH Plate hole of a bone plate for osteosynthesis
DE102006060933A1 (en) 2006-12-20 2008-07-10 Wolter, Dietmar F., Prof. Dr. bone screw
WO2008115318A1 (en) 2007-03-21 2008-09-25 The University Of North Carolina At Chapel Hill Anti-unscrewing and multi-angular fastening apparatuses and methods for surgical bone screw/plate systems
EP2559392B1 (en) 2007-08-13 2014-09-24 Synthes GmbH Highly-versatile variable-angle bone plate system
WO2011076205A1 (en) * 2009-12-22 2011-06-30 Merete Medical Gmbh Bone plate system for osteosynthesis
DE102010038949A1 (en) 2010-08-05 2012-02-09 Dieter Marquardt Medizintechnik Gmbh Osteosynthesis device, has bone plate provided with threaded bore and bone screw provided with screw head, where threaded bore is formed with multi-start internal thread, and bone screw is formed with single-start external thread
US20130138156A1 (en) * 2010-09-02 2013-05-30 Neosteo Osteosynthesis device

Also Published As

Publication number Publication date
US20180008326A1 (en) 2018-01-11
EP3267913A1 (en) 2018-01-17
DE102016002444A1 (en) 2016-09-15
US10335213B2 (en) 2019-07-02

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